Was this something like "open a .docx and use undo a lot", or where there additional steps. If it was with a specific .docx can you attach that .docx here, or provide some more details that would allow us to reproduce this.

I can't reproduce in libreoffice-core-3.4.5.2-15.fc16 by opening the .docx, applying "Complementary Close" to the first paragraph, modifying that style to have a different indent and then ctrl+z repeatedly.
Feel free to reopen if you can still reproduce and give step by step

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